Well..this argument has been going on for years. It would be a bad lie to say that Chester's overall voice has not declined. He is getting older. However it's not because of the screaming. It's age. He still has range because some of the highest notes I've heard him hit without falsetto came on the messenger off of ATS. I can usually hit(pitch wise) most of LP's stuff. I sing in a band but it's pos alt. so my voice is clean. I still however love LP and singing along and I am a tenor and cannot hit without falsetto some of the notes in that song the way he does without using falsetto to do so. So he still has a great range. Now, you cannot judge one live performance to the other because some shows he will be more well rested to others, some shows he'll hit the notes and some he won't because he's not in a studio getting multiple tries to one line or two. He can still scream but chooses not to because he didn't want to be defined by that. This whole THP came out of a lack of high energy power rock in the mainstream. After streaming the entire album multiple times through iTunes you can tell he can still belt out powerful screams like on KTTK. And in regards to some of their older stuff having more energy or power back then compared to now, It's because he is not the hurt young man he used to be. Different things draw emotion from him now. As a singer who writes music, the stuff that draws most to your heart at the time is the stuff that gets the most emotion. Chester also said the need for THP came from the fact that they ended up standing around singing a lot of the music in recent shows because the music was more poppy with less energy. Basically, chester can sing just as well as he did back then, but not for prolonged periods of time which is why some music throughout their tours sounds better some days to the next. His range and power is still there, his range might even be better, just not the endurance and that comes with age.